Left side of chest has like a dull ache not a pain but more of an annoyance. can heart pain be constant and last for 22 days . 20/yo normal ekg normal blood work for heart?

Heart pain does not typically last for this long. You are likely experiencing chest wall pain. This can be due to muscle spasm, cartilage inflammation or even bone pain. Heat to the area and anti-inflammatory medicine like ibuprofen can help with this. You should see a doctor for diagnosis and treatment if this doesn’t help. Good luck to you!

Your pain is far more likely to be of musculo-skeletal origin than related heart. Regular aerobic exercise will help by improving the strength and flexibility of your muscles. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.